<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>盒子模型计算</title>
</head>
<style type="text/css">
	div{margin:10px;
	    padding:5px;
	    border:1px red solid;
	    width:68px;
	    height:48px;}
</style>
<body>
    <!-- 页面总占宽100px,高80px,其中margin:10px\padding:5px\border:1px -->
	<div>盒子模型计算</div>
</body>
</html>